package com.zhb.blog.handler;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;

@ControllerAdvice //拦截所有使用了@Controller的类
public class ControllerExceptionHandler {
    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    /**
     * 统一拦截所有Controller类的exception，并将错误信息返回页面
     * @param request
     * @param e
     * @return model of requestUrl and exception
     */
    @ExceptionHandler(Exception.class) //标识这个方法可以做异常处理
    public ModelAndView exceptionHandler(HttpServletRequest request, Exception e) throws Exception {
        logger.error("Request URL: {}, Exception : {}",request.getRequestURL(),e);

        if (AnnotationUtils.findAnnotation(e.getClass(), ResponseStatus.class) != null) {
            throw e;
        }

        ModelAndView mv = new ModelAndView();
        mv.addObject("url",request.getRequestURL());
        mv.addObject("exception",e);
        mv.setViewName("error/error");
        return mv;
    }
}
